9 results on '"Jin, Kaiqiang"'
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2. The Efficiency of Perfluorohexanone on Suppressing Lithium-Ion Battery Fire and Its Device Development
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Liang, Chuang, Jin, Kaiqiang, Liu, Pengjie, Wang, Chengdong, Xu, Jiajia, Li, Huang, and Wang, Qingsong
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- 2023
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3. Thermal runaway propagation behavior and energy flow distribution analysis of 280 Ah LiFePO4 battery.
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Song, Laifeng, Huang, Zonghou, Mei, Wenxin, Jia, Zhuangzhuang, Yu, Yin, Wang, Qingsong, and Jin, Kaiqiang
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THERMAL batteries , *HEAT transfer , *IRON , *ENERGY storage , *DEBYE temperatures - Abstract
Thermal runaway propagation (TRP) of lithium iron phosphate batteries (LFP) has become a key technical problem due to its risk of causing large-scale fire accidents. This work systematically investigates the TRP behavior of 280 Ah LFP batteries with different SOCs through experiments. Three different SOCs including 40 %, 80 %, and 100 % are chosen. In addition to key TRP characteristic parameters such as temperature, TRP time and speed are analyzed, more importantly, the energy flow distribution during the TRP of large-size LFP module is also revealed. The results indicate that among the three groups of modules, TRP occurs only in the module with 100 % SOC, which is attributed to the higher internal energy (666.11 kJ) and heat transfer power (264.07 W). For the module with 100 % SOC, the TRP time interval fluctuates from 667 s to 1305 s, and the TRP speed is in the range of 0.05–0.12 mm/s. Furthermore, the energy flow distribution indicates that more than 75 % of the energy is used to heat battery itself, and approximately 20 % is carried out by ejecta. Less than 10 % can trigger neighboring batteries into thermal runaway. This work may provide important guidance for the process safety design of energy storage power stations. [ABSTRACT FROM AUTHOR]
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- 2023
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4. The experimental study on a novel integrated system with thermal management and rapid cooling for battery pack based on C6F12O spray cooling in a closed-loop.
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Qin, Peng, Jia, Zhuangzhuang, Jin, Kaiqiang, Duan, Qiangling, Sun, Jinhua, and Wang, Qingsong
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SPRAY cooling , *COOLING , *BATTERY management systems , *METAL spraying , *LIQUID films , *ENTHALPY , *SPRAYING , *ARTIFICIAL pancreases - Abstract
Amongst the background of the popularization of the lithium-ion battery (LIB), the thermal issues have attracted a significant amount of attention. In the present paper, a novel integrated system is proposed with thermal management and rapid cooling based on C 6 F 12 O spray cooling in a closed loop. Through experiments using a 4 × 4 dummy 18650 cylindrical battery pack, the cooling performance of the battery thermal management system (BTMS) based on the C 6 F 12 O spray cooling is demonstrated to be effective. Further, the controllable heat generation benefits for the analysis of heat dissipation mechanisms. For the condition of 6 cm spray height with 2.05 g/s flow rate, the heat is taken away by the liquid film accounted for around 30% of the total heat dissipation, while that of direct spray cooling accounted for around 70%. In the rapid cooling experiment, compared with the blank experiment, the thermal runaway maximum temperature significantly decreased by 517.1 °C and the thermal runaway of the first battery is delayed by 229 s. Owing to the significantly effective heat removal ability of C 6 F 12 O spray cooling, the propagation of the thermal runaway is cut off. • A novel integrated system with thermal management and rapid cooling is proposed. • The effects of spray height, flow rate, and heat generation are explored. • The effectiveness of the proposed management system is proved experimentally. • The propagation of thermal runaway is cut off with the application of spray cooling. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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5. In-situ fabricated succinonitrile-based composite electrolyte for high-performance and safe solid-state lithium batteries.
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Chen, Shiyao, Wang, Shuping, Peng, Qingkui, Wei, Zesen, Cheng, Siyuan, Fang, Zheng, Duan, Peiyu, Cheng, Yuan, Cheng, Yifeng, Jin, Kaiqiang, Jiang, Lihua, and Wang, Qingsong
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LITHIUM cells , *SUPERIONIC conductors , *POLYELECTROLYTES , *SOLID electrolytes , *ELECTROLYTES , *IONIC conductivity , *INTERFACIAL reactions - Abstract
The succinonitrile (SN) plastic crystal electrolyte with excellent comprehensive properties such as high room temperature (RT) ionic conductivity, wide electrochemical window and low cost, making it a promising candidate for RT solid-state lithium batteries (SSLBs). However, severe spontaneous chemical reactions between SN and active Li anode cause serious damage to the electrolyte/electrode interface, which still needs to be further improved. In this work, an in-situ polymerized SN-based composite solid-state electrolyte (CSE) is exploited to conquer the severe side-reactions between SN-based electrolyte and Li anode, the PALA0.5@-CSE (polyacrylonitrile (PAN): modified-Li l.3 Al 0.3 Ti l.7 (PO 4) 3 (LATP@) = 1:0.5, w/w) demonstrates an outstanding ionic conductivity (0.45 mS cm−1), high electrochemical stability (5.1 V) and improved Li+ transference number (0.67) at RT. The Li symmetric cells with PALA0.5@-CSE shows a high critical current density (CCD) of 1.2 mA cm−2, and the Li symmetric cells deliver excellent cycle stability over 500 h, demonstrating the superior ability of PALA0.5@-CSE to suppress the side-reactions between SN and Li anode and the rapid growth of Li dendrite. In Li||LiFePO 4 (LFP) full cell, the SSLBs provide excellent RT rate capability and stable cycling performance. Moreover, the PALA0.5@-CSE possesses high thermal stability and incombustibility, demonstrating its superior safety for the future utilization of SN-based SSLBs. The modification of LATP was effective at stabilizing the interface, the formed robust SEI film could alleviate the severe interfacial side reactions between SN and Li anode. [Display omitted] • High ionic conductivity (0.45 mS cm−1) and Li+ transference number (0.67) is achieved. • The robust SEI film effectively mitigates the uncontrollably parasitic side-reactions. • The PALA0.5@-CSE exhibits high thermal stability and nonflammable. • Solid-state SN-based lithium batteries show superior performances at room temperature. [ABSTRACT FROM AUTHOR]
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- 2024
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6. The preload force effect on the thermal runaway and venting behaviors of large-format prismatic LiFePO4 batteries.
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Jia, Zhuangzhuang, Song, Laifeng, Mei, Wenxin, Yu, Yin, Meng, Xiangdong, Jin, Kaiqiang, Sun, Jinhua, and Wang, Qingsong
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ENERGY storage , *PRESSURE sensors , *STORAGE batteries , *RISK assessment - Abstract
• As the preload force increases, the safety vent opens earlier. • The battery expansion behavior has a mitigating effect on the gas pressure. • By constructing a TR hazard assessment model, the TR hazard is smallest at 3 kN. In electrochemical energy storage systems, large-format LiFePO 4 (LFP) batteries are usually formed the battery pack under preload force. However, the preload force effect on the safety of the batteries remains unclear. In this study, the TR and gas venting of the 280 Ah LFP batteries at 100% state of charge under four preload forces (0, 3, 6, and 9 kN) are investigated experimentally. The novelty compared to previous studies is that the fixture with a pressure sensor is used to set different preload forces before the experiment and monitor the expansion behavior of the LFP batteries during TR. The results quantitatively analyse the relationship between preload force and TR hazard of prismatic LFP battery. Two important results are presented: (I) the gas release inside LFP battery is horizontal and vertical at the same time, and the battery expansion behavior has a mitigating effect on gas pressure. (II) the TR hazard assessment model is pioneered to assess the TR hazard of batteries under four preload forces. The results show that the TR hazard is minimal at 3 kN. These results provide an effective guide to the setting of preload force and the emergency response to TR. [ABSTRACT FROM AUTHOR]
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- 2022
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7. The thermal runaway analysis on LiFePO4 electrical energy storage packs with different venting areas and void volumes.
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Qin, Peng, Jia, Zhuangzhuang, Wu, Jingyun, Jin, Kaiqiang, Duan, Qiangling, Jiang, Lihua, Sun, Jinhua, Ding, Jinghu, Shi, Cheng, and Wang, Qingsong
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ELECTRICAL energy , *ENERGY storage , *THERMAL analysis , *FLAMMABLE gases , *FLAMMABLE limits - Abstract
[Display omitted] With increasingly more electrochemical energy storage systems installed, the safety issues of lithium batteries, such as fire explosions, have aroused greater concerns. In this study, the thermal runaway behaviors of two different structures of lithium–iron-phosphate battery packs were compared. A fire explosion occurred in battery pack I, which had a small venting area and void volume, but battery pack II with a large venting area and the void volume kept safe. To explain these phenomena, a new experimental method coupling multiple measurements was proposed in this study to survey the velocity, composition, and temperature of venting gas. The venting gas velocity had two peaks, with its maximum value reaching about 270 m/s. Besides, the venting gas was mainly composed of hydrogen and carbon dioxide, accounting for around 30.33% and 38.86%, respectively. With the experimental data used as boundary conditions in a mathematical model, the diffusion behaviors of the venting gas within these two battery packs were derived. By comparing the flammable gas concentration with their lower explosion limits and upper limits, this study found that the high concentration of hydrogen and ethylene might bear the main responsibility for the fire explosion in battery pack I. [ABSTRACT FROM AUTHOR]
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- 2022
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8. Quantitative analysis of aging and detection of commercial 18650 lithium-ion battery under slight overcharging cycling.
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Liu, Jialong, Peng, Wen, Yang, Maoping, Jin, Kaiqiang, Liu, Pengjie, Sun, Jinhua, and Wang, Qingsong
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LITHIUM-ion batteries , *QUANTITATIVE research , *BEHAVIORAL assessment , *LOW voltage systems - Abstract
Lithium-ion batteries are widely used in electric vehicles to solve the problems of greenhouse gas emission. However, overcharging occurs due to the inconsistency of lithium-ion batteries, malfunction of charge control and inappropriate battery management. In order to solve the safety and cycle life problems of batteries suffering slight overcharging, quantitative analysis of the aging behavior, aging mechanisms and detection of slight overcharging cycling are studied in this manuscript. The results indicate that the cycle life of battery decreases linearly and exponentially with the upper cut-off voltage increasing when capacity and resistance are used as the threshold of the end of life respectively. The batteries have tolerance to slight overcharging with voltage lower than 4.6 V. The generated gas is not the main aging mechanism. Loss of active material is the main aging mechanism when the batteries are cycled at 4.4 V. Charging stress is the key factor triggering the loss of active material. The main aging mechanism becomes to be loss of lithium with the increase of voltage and cycle number due to the electrolyte oxidation, reduction and lithium plating. The differential voltage, coulombic efficiency and fast resistance increase are used as warming parameters of slight overcharging cycling. • Battery aging induced by slight overcharging cycling is analyzed quantitatively. • Slight overcharging influences power fading of battery more. • Lithium plating and electrolyte oxidation, reduction are the key factors of aging. • Warming parameters are extracted to detect slight overcharging cycling. [ABSTRACT FROM AUTHOR]
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- 2022
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9. Experimental investigation on intermittent spray cooling and toxic hazards of lithium-ion battery thermal runaway.
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Zhang, Lin, Duan, Qiangling, Meng, Xiangdong, Jin, Kaiqiang, Xu, Jiajia, Sun, Jinhua, and Wang, Qingsong
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SPRAY cooling , *THERMAL batteries , *LITHIUM-ion batteries , *SURFACE temperature , *HEAT transfer , *SPRAYING & dusting in agriculture , *TONOMETERS , *ATOMIZERS - Abstract
• The internal temperature of the cell was measured to study the temperature rebound. • The cooling effect of intermittent spray with different periods and duty cycles were studied. • The gas toxicity of LIBs under a different SOC and water spray was evaluated. The fire extinguishing and cooling of lithium-ion battery thermal runaway have attracted significant research attention. In this study, an intermittent spray method for cooling lithium-ion battery during thermal runaway is proposed. The internal temperature and voltage of the battery, as well as the gases generated during thermal runaway are investigated. In addition, the extinguishing and cooling ability of the intermittent spray method at different intermittent periods (cycle consisting of a spray time and an interval time) and duty cycles (the percentage of the pulse duration occupied in a cycle) are compared and discussed. Furthermore, the toxic effects of the generated gases are evaluated. Experimental results reveal that the internal temperature of the battery is significantly higher than the surface temperature during the thermal runaway. Particularly, the internal temperature of the cell with 100% state of charge was as high as approximately 1000 ℃. In addition, the surface temperature of the cell may rebound after cooling owing to the insufficient heat transfer and a large radial temperature gradient of the battery. Furthermore, intermittent spray with more spray pulses of shorter duration performs better cooling effect. Particularly, the cooling effect initially increases, and then decreases with decreasing duty cycle. The major toxic gases produced during thermal runaway are CO and HF, whose yield increases with an increase in the state of charge, and the toxicity of these gases increases after the water spray. The findings of this study indicate that strict safety protection is needed when water spray is used to extinguish LIB fires. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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